Simple Projectile Physics

I have all this stuff written down somewhere, but I think it all went up into the loft six months ago.

Taking a projectile at any given height and with any given velocity ( positive or negative ) I want to be able to find the new height after a period of time.

The only formula I could find from googling some projectile physics pages was this :

EndY=StartY+(VY*T)-(0.5*((Gravity*Time)^2))

But that doesn't look right to me, and a quick test indicates it's not returning the correct answer. Does someone have the correct formula?

That's the correct formula.

s = ut * (1/2)at^2

Displacement = initial velocity * time + half of acceleration * time squared.

How did you do your 'quick test'? I'd bank on *that* being wrong.

what kind of game are ye making syb?

Ah yeah, thanks. That looks more like it. I had the brackets in the wrong place in my original post. ( It was squaring gravity multiplied by time instead of just squaring time. )

I think the test is ok. I'm just firing off projectiles continuously and then randomly picking a point at which to predict where the shell will be in 20 frames and then seeing if the prediction was right. It was always predicting too high.



I'm not making a game exactly. Just thought it was about time I updated Tennis Babes a bit.

Hi all! Greetings from Sweden!

Maybe that would work for a "throwing parameter" directly translated from Swedidh, wich i need for my "Scorched Tanks"-clone. You know that old Amiga game wich sort of reminds you about the first "Worms" where theres tanks on different locations on a 2Dterrain.

I havent got it to work just yet allthough i have seen some mathematic calculations of it.

Also i have studied this in school a while ago, but you know how easy it is to forget.

Any Ideas?